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Finding the Fourth Proportional to 118.88, 164.08 and 91.22

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Solution

The fourth proportional to 118.88, 164.08 and 91.22 is: 125.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.88 : 164.08 = 91.22 : x
  2. Step 2: Convert to fraction form
    118.88/164.08 = 91.22/x
  3. Step 3: Cross multiply
    118.88x = 164.08 × 91.22
  4. Step 4: Simplify right side
    118.88x = 14,967.38
  5. Step 5: Solve for x
    x = 14,967.38/118.88
  6. Step 6: Final answer
    x = 125.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.